1982

7.6

2004

6.8

2015

7.3

2009

5.5

2010

6.2

2003

5.2

2006

6.5

1970

7.7

1994

6.5

2006

6.7

2001

6.4

1949

7.2

1987

6.1

2011

6.2

1982

6.4

2013

6.7

1965

6.5

1971

6.3

2021

7.8